Feeding, calories and portion math for dogs and cats, with the sources shown.

About 4 cups of typical kibble per pound, though dense kibble runs closer to 3 and light kibble up to 5. Here is the bag math, plus the one-time trick that makes it exact.

The working rule: about a pound per month of age until six months. A 4-month-old kitten should weigh around 4 pounds. Here is the month-by-month chart and when to worry.